FSX Deluxe Spanish

Hello everyone. I just bought FSX Deluexe in Argentina. I read in some place
(not MS) that the Deluxe version was going to give me the choice to install
it in english or spanish but it only installs it in Spanish. Is there any way
to change it to English? I've been playing the english version before and I
dont get used to some spanish terms. Thank You so much anyone who can tells
me there is a way to put it in english!